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package com.oracle.truffle.api.test.polyglot;

import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.HostAccess;
import org.junit.Assert;
import org.junit.Test;

import com.oracle.truffle.api.ContextThreadLocal;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.test.common.AbstractExecutableTestLanguage;

public class AutomaticLeaveTest {

    static class ThreadContext {

    }

    @TruffleLanguage.Registration
    static class AutomaticLeaveInHostCallTestLanguage extends AbstractExecutableTestLanguage {

        final ContextThreadLocal<ThreadContext> threadContext = locals.createContextThreadLocal((c, t) -> new ThreadContext());

        @Override
        protected Object execute(RootNode node, Env env, Object[] contextArguments, Object[] frameArguments) throws Exception {
            if (contextArguments[0] != null) {
                InteropLibrary.getUncached().invokeMember(contextArguments[0], "close");
            }
            // If the close operation automatically leaves the explicitly entered context, then
            // context thread local get fails.
            threadContext.get();
            return null;
        }
    }

    public static class ContextCloser {
        private final Context context;

        public ContextCloser(Context context) {
            this.context = context;
        }

        public void close() {
            context.close();
        }
    }

    @Test
    public void testAutomaticLeave() {
        try (Context context = Context.newBuilder().allowHostAccess(HostAccess.ALL).build()) {
            context.enter();
            AbstractExecutableTestLanguage.evalTestLanguage(context, AutomaticLeaveInHostCallTestLanguage.class, "", new Object[]{null});
            Context.getCurrent();
        }
        AbstractPolyglotTest.assertFails(Context::getCurrent, IllegalStateException.class, (e) -> Assert.assertTrue(e.getMessage().startsWith("No current context is available.")));
    }

    @Test
    public void testNoAutomaticLeaveInHostCall() {
        try (Context context = Context.newBuilder().allowHostAccess(HostAccess.ALL).build()) {
            context.enter();
            AbstractExecutableTestLanguage.evalTestLanguage(context, AutomaticLeaveInHostCallTestLanguage.class, "", new ContextCloser(context));
            Context.getCurrent();
        }
        AbstractPolyglotTest.assertFails(Context::getCurrent, IllegalStateException.class, (e) -> Assert.assertTrue(e.getMessage().startsWith("No current context is available.")));
    }
}
